20381372 has 12 divisors (see below), whose sum is σ = 38909976. Its totient is φ = 9264240.

The previous prime is 20381369. The next prime is 20381399. The reversal of 20381372 is 27318302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231563 + ... + 231650.

It is an arithmetic number, because the mean of its divisors is an integer number (3242498).

Almost surely, 2^20381372 is an apocalyptic number.

20381372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20381372 is a deficient number, since it is larger than the sum of its proper divisors (18528604).

20381372 is a wasteful number, since it uses less digits than its factorization.

20381372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463228 (or 463226 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20381372 is about 4514.5732910210. The cubic root of 20381372 is about 273.1562479107.

Adding to 20381372 its reverse (27318302), we get a palindrome (47699674).

The spelling of 20381372 in words is "twenty million, three hundred eighty-one thousand, three hundred seventy-two".